Toothed-wheel change gear pump for conveyance and a gearbox for transmission oil intermediate storage

Abstract

In a toothed-wheel change gear, a gear pump for the conveyance of transmission oil is arranged in a separate gearbox chamber of a gearbox. Leakage oil flowing out at the gear pump is intermediately stored in the gearbox chamber in a controlled manner.

What is claimed is: 
     
       1. In a drive united formed from an engine, hydrodynamic torque converter and automatically shifting toothed-wheel change gear in force flux series with one another an arrangement comprising a gearbox chamber above a transmission for the temperature-dependent intermediate storage of transmission oil and limited by a gearbox wall arranged perpendicular to a horizontal gear rotation axis and by a pressed sheet metal closing cover located opposite this wall, a gear pump for conveying the transmission oil arranged in the gearbox chamber, a thermostatic run-off control valve operative as a function of the temperature of the transmission for controlling oil run-off from the gearbox chamber into the sump, wherein the gearbox chamber is arranged in a space between the converter and the gear, the closing cover is adjacent the converter, the gear pump has a casing fastened to a side of the gearbox wall facing the closing cover, both the closing cover and the pump casing of the gear pump each have a passage for a pump drive shaft aligned with the gear rotation axis, and the pump casing has at least one orifice opening into the gearbox chamber such that the feed to the gearbox chamber is obtained by a controlled outflow of leakage oil from the gear pump. 
     
     
       2. The arrangement according to claim 1, wherein the closing cover is of substantially rotationally symmetrical design. 
     
     
       3. The arrangement according to claim 1, wherein only casing surfaces of the pump casing sealing directly relative to one another are used for sealing off the pump casing from the gearbox wall. 
     
     
       4. The arrangement according to claim 1, wherein the closing cover is of substantially rotationally symmetrical design. 
     
     
       5. The arrangement according to claim 1, wherein a shaft seal is inserted into the passage of the closing cover. 
     
     
       6. The arrangement according to claim 5, wherein the closing cover is of substantially rotationally symmetrical design. 
     
     
       7. The arrangement according to claim 6, wherein only casing surfaces of the pump casing sealing directly relative to one another are used for sealing off the pump casing from the gearbox wall. 
     
     
       8. The arrangement according to claim 1, wherein an outer edge of the closing cover has a collar-shaped beading with a rolled-in receiving groove for an annular gasket for sealing off relative to the circumferential wall of the gearbox chamber. 
     
     
       9. The arrangement according to claim 8, wherein the closing cover is of substantially rotationally symmetrical design. 
     
     
       10. The arrangement according to claim 9, wherein only casing surfaces of the pump casing sealing directly relative to one another are used for sealing off the pump casing from the gearbox wall. 
     
     
       11. The arrangement according to claim 10, wherein a shaft seal is inserted into the passage of the closing cover. 
     
     
       12. The arrangement according to claim 1, wherein the closing cover has a form matching an outer contour of the torque converter adjacent therein. 
     
     
       13. The arrangement according to claim 12, wherein the closing cover is of substantially rotationally symmetrical design. 
     
     
       14. The arrangement according to claim 13, wherein only casing surfaces of the pump casing sealing directly relative to one another are used for sealing off the pump casing from the gearbox wall. 
     
     
       15. The arrangement according to claim 14, wherein a shaft seal is inserted into the passage of the closing cover. 
     
     
       16. The arrangement according to claim 15, wherein an outer edge of the closing cover has a collar-shaped beading with a rolled-in receiving groove for an annular gasket for sealing off relative to the circumferential wall of the gearbox chamber. 
     
     
       17. The arrangement according to claim 1, wherein a roller bearing supports the pump drive shaft in the pump casing the roller bearing being closed off from an interior of the pump-casing, with the exception of an annular gap between the pump drive shaft and the corresponding passage of the pump casing, and is open to the gearbox chamber. 
     
     
       18. The arrangement according to claim 17, wherein the closing cover is of substantially rotationally symmetrical design. 
     
     
       19. The arrangement according to claim 18, wherein only casing surfaces of the pump casing sealing directly relative to one another are used for sealing off the pump casing from the gearbox wall. 
     
     
       20. The arrangement according to claim 19, wherein a shaft seal is inserted into the passage of the closing cover. 
     
     
       21. The arrangement according to claim 20, wherein an outer edge of the closing cover has a collar-shaped beading with a rolled-in receiving groove for an annular gasket for sealing off relative to the circumferential wall of the gearbox chamber. 
     
     
       22. The arrangement according to claim 21, wherein the closing cover has a form matching an outer contour of the torque converter adjacent therein. 
     
     
       23. The arrangement according to claim 17, wherein the annular gap is configures to allow a controlled outflow of leakage oil. 
     
     
       24. The arrangement according to claim 1, wherein the gearbox wall has an overflow channel which extends from an uppermost region of the gearbox chamber and which opens into a further gearbox chamber of a gearbox. 
     
     
       25. The arrangement according to claim 1, wherein the pump casing has a throttle channel which connects a box chamber of the gearbox wall connected to a pressure lubrication means to the gearbox chamber for the intermediate storage. 
     
     
       26. The arrangement according to claim 1, wherein the pump casing has a throttle channel which connects a pump chamber under feed pressure to the gearbox chamber for the intermediate storage.